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vestigial remnant
In reference to a trace or rudimentary structure, generally the remanant(s) of an embryonic or evolutionary structure no longer of functional significance in the mature organism.
Specific
appendix; vermiform appendix
vestigial left superior vena cava (vein of Marshall)
General
anatomic structure
References
Stedman's Medical Dictionary 27th ed, Williams &
Wilkins, Baltimore, 1999.